diff --git a/symfony/flex/1.0/.env b/symfony/flex/1.0/.env
index 7d391a90..caf3356c 100644
--- a/symfony/flex/1.0/.env
+++ b/symfony/flex/1.0/.env
@@ -9,6 +9,7 @@
 # Real environment variables win over .env files.
 #
 # DO NOT DEFINE PRODUCTION SECRETS IN THIS FILE NOR IN ANY OTHER COMMITTED FILES.
+# https://symfony.com/doc/current/configuration/secrets.html
 #
 # Run "composer dump-env prod" to compile .env files for production use (requires symfony/flex >=1.2).
 # https://symfony.com/doc/current/best_practices.html#use-environment-variables-for-infrastructure-configuration